alt-numpad-keys: preference variable

Default value: 0

Epsilon for Windows normally interprets Alt plus Numeric Pad keys as a
way to enter a character by its numeric code, as in other Windows
programs. Type a number on the numeric pad while holding down Alt to
use this feature.

But if this variable is nonzero, Epsilon instead treats Alt plus
Numpad keys as individual keys, which can be bound to commands like
any other keys. (The Win32 Console version of Epsilon ignores this
setting under Windows 95/98/ME.)